Question

A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.

Answer 1

The person is suffering from hypermetropia.

Two possible causes :

(i) Greater focal length of the lens. 

(ii) Eyeball becoming smaller. 

Use the convex lens of focal length